Here is the #Wired story from 1997 of how the first computer social network The Well was destroyed by deleting of posts
https://www.wired.com/1997/05/ff-well/
A key passage:
> On July 5, 1992, he logged on and executed a mass scribble over the next three days. The mass scribbling tool had been written a few years earlier by Andy Beals in a burst of anger at The Well. Mass scribble allowed you to easily erase all your comments in a topic, no matter when they were written. This time, while Mandel erased only his own postings, he cast a wider net across The Well, far beyond his earlier targets of the Weird and Future conferences. This time, he went from conference to conference and deleted nearly everything he had posted in each one.